问题
选择题
下列有关氧气的说法不正确的是（ ）
A．物质与氧气发生的反应都是氧化反应
B．鱼、虾能在水中生存说明水中溶有氧气
C．硫在氧气中燃烧发出微弱的淡蓝色火焰
D．氧气可以压缩贮存于钢瓶中，是因为氧气分子间有一定的间隔
答案
答案：C
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下列有关氧气的说法不正确的是（ ）
A．物质与氧气发生的反应都是氧化反应
B．鱼、虾能在水中生存说明水中溶有氧气
C．硫在氧气中燃烧发出微弱的淡蓝色火焰
D．氧气可以压缩贮存于钢瓶中，是因为氧气分子间有一定的间隔
答案：C
| Aspirin is one of the safest and most effective drugs invented by man. The most popular medicine in the world today, it is an effective pain reliever. Its bad effects are relatively mild. It is also cheap. For millions of people suffering from arthritis, it is the only thing that works. Aspirin, in short, is truly the 20th-century wonder drug. It is also the second largest suicide drug and is the leading cause of poisoning among children. It has side effects that, although relatively mild, are largely unrecognized among users. Although aspirin was first sold by a German company in 1899, it has been around much longer than that. Hippocrates, in ancient Greece, understood the medical value of tree barks and leaves which today are known to contain a chemical found in aspirin. During the 19th century. there was a great deal of experimentation in Europe with this chemical, and it led to the introduction of aspirin. By 1915, aspirin tablets were available in the United States. A small quantity of aspirin relieves pain and inflammation. It also reduces fever by affecting some of the body’s reactions. Aspirin is very irritating to the stomach lining. The best way is to chew the tablets before swallowing them with water, but few people can stand the bitter taste. Some people suggest crashing the tablets in milk or orange juice. |
Aspirin was invented in ______.
A．the 20th century
B．the 19th century
C．ancient Greece
D．ancient Germany